I have wired a humidifier for a friend a few years back. The place where he got it, walked me through, how to connect it to the furnace terminals.
I didn't understand how...But it worked, only when the heating fan was running on the furnace.
I now have my own furnace and humidifier. The humidifier runs anytime the humidistat calls for more moisture, even when the furnace isn't running.
Can anyone tell me how to reconnect the humidistat to the furnace terminals, so the water only runs when the heat fan is on?